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Biomedical subjects

D L Mitchell

Publications and source records attributed to D L Mitchell.

142 records · Page 8Linked to original sources
PubMed1976

Rehabilitating dentulous hemimandibulectomy patients.

A hemimandibulectomy can have many debilitating consequences, such as an eccentric occlusion, a disoriented masticatory cycle, facial disfigurement, distorted speech, and salivation problems. If prosthetic treatment begins some time following surgery and the cicatricial tissue has already consolidated, additional treatment time is necessary. A technique is described which combines crowns with a maxillary prosthesis to guide the mandible into a functional occlusion.

Crowns↗
PubMed1975

Arcial growth with metallic implants in mandibular growth prediction.

The present investigation was undertaken to determine whether the Ricketts theory of arcial growth of the mandible can be put to practical use by the clinician to predict mandibular morphology. Eight subjects (six girls and two boys) were selected from the earliest implant samples at the Orthodontic Department of Emory University School of Dentistry. The initial cephalograms were coded and sent to Ricketts, and a 6-year manual growth forecast using the arcial method was requested. The final cephalograms were traced and compared. The three tracings (initial, prediction, and final) were superimposed over the metallic implants and presented on a case-by-case basis. The forecasts, in form, were clinically acceptable in five of the eight cases. In two of the cases (girls) (Cases 2 and 4) a hand-wrist radiograph to determine skeletal age would have improved their accuracy. The forecast in Case 2 was not acceptable. In view of our results in this small sample, the arcial method appears valid for prediction of amndibular growth; however, hand-wrist radiographs will improve the accuracy of short-range predictions of the amount of growth expected. For this reason, the orthodontist should constantly monitor his patients, watching for each individual to assert himself.

Adolescent↗
PubMed1975

Attempted orthodontic movement in the presence of suspected ankylosis.

A 37-year-old man with suspected ankylosis ("submerged" teeth, radiographically obliterated periodontal membranes, and sharp or ringing percussion tests) was subjected to attempted orthodontic movement. The maxillary canine and posterior segments were chosen as treatment areas. While the terms "light" and "heavy" are relative, forces ranging from 6 to 24 ounces were variants great enough in the areas treated to have elicited movement if movement were possible. After continuous forces had been applied for 110 days, measurements showed no movement in either maxillary quadrant.

Adult↗
PubMed1975

An introduction to the study of medicine: phase I of the McMaster M.D. program.

"Phase I" describes the initial 11 weeks of study in the M.D. training program offered by the Faculty of Medicine of McMaster University. This three-year program stresses the responsibility of students for their own education, encourages self-directed learning using realistic biomedical problems, and offers little didactic instruction. Students are assigned to tutorial groups, and much of the educational thrust of the program is built upon interactions within these groups. Phase I is designed to allow students to adapt to a less structured environment, and intensive faculty support is available. The successes and failures of Phase I of the program were examined using a combined questionnaire and interview at various stages during the 11-week period. Not all program goals were satisfactorily measured, but those that could be assessed appeared to have been attained by most students.

Adaptation, Psychological↗
PubMed1975

An innovative course in undergraduate neuroscience. Experiment in problem-based learning with 'problem boxes'.

A novel course in undergraduate neurosciences is described in this paper. The course features a 'problem-box' and use of an educational prescription, each designed to foster the continual development of problem solving and self-directed study skills. The use of a wide range of evaluation tools, stimulated patients, questionnaires, tutorial evaluations, and interviews indicated that it was successful in its attempt. The philosophy of the design of problem-boxes and the problem-solving approach are discussed.

Curriculum↗
PubMed1975

The simulated tutorial. Method for assessing medical school applicants.

The simulated tutorial is a method for selecting medical students by their performance in a small problem-solving group, currently being tested at McMaster University. Four hundred and thirty-two applicants were randomly allocated to groups consisting of 5 or 6 members, assigned a group leader, and asked to work through two unstructured problem situations in a 50-minute session. Assessors, seated behind a one-way mirror, evaluated applicants according to their abilities to relate to their peers, to function in the group, and to define issues in the problem situations. Feedback from the assessors and applicants suggests that the simulated tutorial is potentially useful as a selection tool. All assessors thought they were able to evaluate the 5 or 6 applicants in the group in the time provided. Nearly 80% of the applicants who anonymously returned questionnaires felt they were able to express themselves during their simulated tutorial. The data also suggest that applicants with experience in small groups and applicants previously rated as having outstanding 'personal qualities' are given higher ratings than other applicants. A validation study of the simulated tutorial, comparing individual's scores with evaluations of performance in tutorial groups in the undergraduate M.D. programme, is currently in progress.

Age Factors↗
PubMedDate not supplied

Electromyographic investigations of the tongue and circumoral muscular sling with fine-wire electrodes.

The electromyographic (EMG) examination of 11 normal individuals in whom bipolar fine-wire indwelling electrodes were placed showed no EMG activity during rest periods and only very slight to slight activity during normal oral functionsmduring aberrant oral activity, such as thumb-sucking, the orbicularis oris and genioglossus muscles gave a marked EMG response and the buccinator muscles were slightly active. These findings may help explain the classical malocclusions seen in tongue-thrusters and thumb-suckers.

Adult↗
PubMedDate not supplied

Soft liner-retained, implant-supported overdenture: a technical note.

This paper describes the design and fabrication of a soft liner-retained, implant-supported overdenture used in 10 patients over a period of 1 to 6 years. A final complete denture impression is made of the dental arch, including implant abutments extending 5 mm above the gingival tissue. The master cast is fabricated with actual abutments placed in the impression. After the final wax try-in, the denture is flasked in the usual manner with the metal abutments in place. Before packing with acrylic resin, plastic tubing 1 to 2 mm thick is placed around each abutment. The denture is trial packed and allowed to bench cure over night. The plastic tubing is then removed and a soft denture lining material is placed in these areas only. The flask is closed and cured according to the manufacturer's recommendation. The denture is delivered as a conventional overdenture.

Acrylic Resins↗